CORD-2618 remove legacy vtn onboarding recipe

Change-Id: Ib5769dda87fa129f1fb279243db37af6d8cd4234
diff --git a/xos/vtn-onboard.yaml b/xos/vtn-onboard.yaml
deleted file mode 100644
index bc9b48e..0000000
--- a/xos/vtn-onboard.yaml
+++ /dev/null
@@ -1,33 +0,0 @@
-
-# Copyright 2017-present Open Networking Foundation
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-
-tosca_definitions_version: tosca_simple_yaml_1_0
-
-description: Onboard the exampleservice
-
-imports:
-   - custom_types/xos.yaml
-
-topology_template:
-  node_templates:
-    servicecontroller#vtn:
-      type: tosca.nodes.ServiceController
-      properties:
-          base_url: file:///opt/xos_services/vtn-service/xos/
-          # The following will concatenate with base_url automatically, if
-          # base_url is non-null.
-
-